001/*
002 * Copyright (C) 2013 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.collect.testing.google;
018
019import static com.google.common.collect.testing.Helpers.assertEmpty;
020import static com.google.common.collect.testing.features.CollectionSize.ZERO;
021import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_REMOVE;
022import static com.google.common.collect.testing.google.GoogleHelpers.assertEmpty;
023
024import com.google.common.annotations.GwtCompatible;
025import com.google.common.collect.Multimap;
026import com.google.common.collect.testing.features.CollectionSize;
027import com.google.common.collect.testing.features.MapFeature;
028import java.util.Collection;
029import java.util.Map;
030import java.util.Map.Entry;
031import org.junit.Ignore;
032
033/**
034 * Tests for {@link Multimap#clear()}.
035 *
036 * @author Louis Wasserman
037 */
038@GwtCompatible
039@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
040@SuppressWarnings("JUnit4ClassUsedInJUnit3")
041public class MultimapClearTester<K, V> extends AbstractMultimapTester<K, V, Multimap<K, V>> {
042  @CollectionSize.Require(absent = ZERO)
043  @MapFeature.Require(absent = SUPPORTS_REMOVE)
044  public void testClearUnsupported() {
045    try {
046      multimap().clear();
047      fail("Expected UnsupportedOperationException");
048    } catch (UnsupportedOperationException expected) {
049    }
050  }
051
052  private void assertCleared() {
053    assertEquals(0, multimap().size());
054    assertEmpty(multimap());
055    assertEquals(multimap(), getSubjectGenerator().create());
056    assertEmpty(multimap().entries());
057    assertEmpty(multimap().asMap());
058    assertEmpty(multimap().keySet());
059    assertEmpty(multimap().keys());
060    assertEmpty(multimap().values());
061    for (K key : sampleKeys()) {
062      assertGet(key);
063    }
064  }
065
066  @MapFeature.Require(SUPPORTS_REMOVE)
067  public void testClear() {
068    multimap().clear();
069    assertCleared();
070  }
071
072  @MapFeature.Require(SUPPORTS_REMOVE)
073  public void testClearThroughEntries() {
074    multimap().entries().clear();
075    assertCleared();
076  }
077
078  @MapFeature.Require(SUPPORTS_REMOVE)
079  public void testClearThroughAsMap() {
080    multimap().asMap().clear();
081    assertCleared();
082  }
083
084  @MapFeature.Require(SUPPORTS_REMOVE)
085  public void testClearThroughKeySet() {
086    multimap().keySet().clear();
087    assertCleared();
088  }
089
090  @MapFeature.Require(SUPPORTS_REMOVE)
091  public void testClearThroughKeys() {
092    multimap().keys().clear();
093    assertCleared();
094  }
095
096  @MapFeature.Require(SUPPORTS_REMOVE)
097  public void testClearThroughValues() {
098    multimap().values().clear();
099    assertCleared();
100  }
101
102  @MapFeature.Require(SUPPORTS_REMOVE)
103  @CollectionSize.Require(absent = ZERO)
104  public void testClearPropagatesToGet() {
105    for (K key : sampleKeys()) {
106      resetContainer();
107      Collection<V> collection = multimap().get(key);
108      multimap().clear();
109      assertEmpty(collection);
110    }
111  }
112
113  @MapFeature.Require(SUPPORTS_REMOVE)
114  @CollectionSize.Require(absent = ZERO)
115  public void testClearPropagatesToAsMapGet() {
116    for (K key : sampleKeys()) {
117      resetContainer();
118      Collection<V> collection = multimap().asMap().get(key);
119      if (collection != null) {
120        multimap().clear();
121        assertEmpty(collection);
122      }
123    }
124  }
125
126  @MapFeature.Require(SUPPORTS_REMOVE)
127  public void testClearPropagatesToAsMap() {
128    Map<K, Collection<V>> asMap = multimap().asMap();
129    multimap().clear();
130    assertEmpty(asMap);
131  }
132
133  @MapFeature.Require(SUPPORTS_REMOVE)
134  public void testClearPropagatesToEntries() {
135    Collection<Entry<K, V>> entries = multimap().entries();
136    multimap().clear();
137    assertEmpty(entries);
138  }
139}